Stoski Adriana, Machado Bruno Rafael, Vilsinski Bruno Henrique, Carvalho Lee Marx Gomes de, Muniz Edvani Curti, Almeida Carlos Alberto Policiano
Interfacial Science Laboratory, Department of Chemistry, Midwestern State University, Guarapuava 85040-080, PR, Brazil.
Department of Chemistry, State University of Maringa, Maringá 87020-900, PR, Brazil.
Materials (Basel). 2024 Jun 20;17(12):3029. doi: 10.3390/ma17123029.
Modified clays with organic molecules have many applications, such as the adsorption of pollutants, catalysts, and drug delivery systems. Different methodologies for intercalating these structures with organic moieties can be found in the literature with many purposes. In this paper, a new methodology of modifying Sodium Montmorillonite clays (Na-Mt) with a faster drying time was investigated by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), BET, and thermogravimetric analysis (TG and DTG). In the modification process, a mixture of ethyl alcohol, DMSO, and Na-Mt were kept under magnetic stirring for one hour. Statistical analysis was applied to evaluate the effects of the amount of DMSO, temperature, and sonication time on the modified clay (DMSO-SMAT) using a 2-factorial design. XRD and FTIR analyses showed the DMSO intercalation into sodium montmorillonite Argel-T (SMAT). An average increase of 0.57 nm for the interplanar distance was found after swelling with DMSO intercalation. BET analysis revealed a decrease in the surface area (from 41.8933 m/g to 2.1572 m/g) of Na-Mt when modified with DMSO. The porosity increased from 1.74 (SMAT) to 1.87 nm (DMSO-SMAT) after the application of the methodology. Thermal analysis showed a thermal stability for the DMSO-SMAT material, and this was used to calculate the DMSO-SMAT formula of Na[AlMg]SiO(OH) · 0.54 DMSO. Statistical analysis showed that only the effect of the amount of DMSO was significant for increasing the interlayer space of DMSO-SMAT. In addition, at room temperature, the drying time of the sample using this methodology was 30 min.
含有有机分子的改性粘土有许多应用，如污染物吸附、催化剂和药物递送系统。文献中可以找到多种用于将这些结构与有机部分插层的方法，目的各异。本文通过X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、BET和热重分析（TG和DTG）研究了一种干燥时间更快的改性钠蒙脱石粘土（Na-Mt）的新方法。在改性过程中，将乙醇、二甲基亚砜（DMSO）和Na-Mt的混合物在磁力搅拌下保持1小时。采用二因素设计，应用统计分析来评估DMSO用量、温度和超声处理时间对改性粘土（DMSO-SMAT）的影响。XRD和FTIR分析表明DMSO插层进入了钠蒙脱石Argel-T（SMAT）。DMSO插层溶胀后，发现层间距平均增加了0.57 nm。BET分析表明，用DMSO改性时，Na-Mt的表面积减小（从41.8933 m²/g降至2.1572 m²/g）。应用该方法后，孔隙率从1.74（SMAT）增加到1.87 nm（DMSO-SMAT）。热分析表明DMSO-SMAT材料具有热稳定性，并据此计算出Na[AlMg]SiO(OH)·0.54 DMSO的DMSO-SMAT化学式。统计分析表明，只有DMSO用量对增加DMSO-SMAT的层间间距有显著影响。此外，在室温下，使用该方法样品的干燥时间为30分钟。
